Ben Silbermann and Evan Sharp, co-founders of Pinterest

Ben Silbermann, Evan Sharp, and Paul Sciarra cofounded Pinterest.

Ages: 31

What they've done: Silbermann left Google to found Pinterest, a photo and inspiration platform that some believe will eclipse Facebook, Twitter and even Google in revenue. He co-founded it with Evan Sharp, and their company is now worth more than $5 billion.

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Elizabeth Holmes, founder of Theranos

Courtesy Theranos

Age: 30

What she's done: Holmes is the youngest female billionaire in the world who is entirely self-made. Holmes dropped out of Stanford to create Theranos, a company that could revolutionize modern medicine by creating better blood tests.

Theranos' company is working on a way to gather a ton of information from just a drop of blood (think a fingerprick) as opposed to a collecting vials and vials of it through needles in the arm.

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Kevin Systrom and Mike Krieger, cofounders of Instagram

Getty Images/Paul Zimmerman

Age: 29 and 28

What he's done: In 2010, Systrom and Krieger cofounded Instagram. Instagram quickly became the most popular mobile photo app and now has nearly 230 million monthly active users, which is roughly the size of Twitter.

Drew Houston and Arash Ferdowsi, cofounders of Dropbox

Age: 31 and 29

What he's done: In 2007, Drew Houston and Arash Ferdowsi cofounded Dropbox. Since then Apple offered to acquire it, but they opted to keep building the business. Earlier this year Dropbox raised more than $350 million at a $10 billion+ valuation. It has more than 4 million business subscribers and it reportedly generated more than $200 million last year. It's expected to go public within a year.

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Aaron Levie, founder of Box

Box.net

Age: 28

What he's done: Box began as a college business plan project in 2005 and officially launched in 2006. Since then its young founder has raised hundreds of millions and his enterprise file sharing/storing company is expected to go public within a year.

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Brian Chesky, CEO of Airbnb

Vator.tv

Age: 31

What he's done: In 2008, Chesky along his two 20-something cofounders Joe Gebbia and Nathan Blecharczyk, launched Airbnb. It made a splash at Y Combinator Demo Day and later became the program's first billion-dollar company.

The peer-to-peer apartment rental site has raised $120 million at a $1.3 billion valuation.

David Karp, founder of Tumblr

What he's done: In 2007, at age 21, Karp founded Tumblr. Yahoo acquired Karp's company for $1 billion in 2013. Karp is still the head of Tumblr, which has continued to grow in both traffic and revenue under Yahoo.

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Adam D'Angelo, Cofounder and CEO of Quora

Age: 29

What he's done: D'Angelo was the first lead technical engineer at Facebook. He left and started Q&A site Quora in early 2010. In April the company raised $80 million at an estimated $800 million valuation. D'Angelo is also an angel investors in a number of startups.

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Erie Meyer, Head of US Digital Service for The White House

Courtesy of Erie Meyer

Age: 30

What she's done: In August, Meyer was appointed to The White House's US Digital Service team, where she aids tech initiatives for the government and helps tech leaders work better with the government. She formerly founded a listserv for women in technology, Tech Ladymafia.

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Evan Spiegel and Bobby Murphy, cofounders of Snapchat

Jemal Countess / Getty Images

Age: 23 and 25

What they've done: Spiegel and Murphy were Stanford fraternity brothers who co-founded $10 billion disappearing photo application, Snapchat. The two reportedly turned down a $3-4 billion buyout offer from Facebook and it's estimated that their platform now has more than 100 million users. The last round of financing reportedly made Spiegel a billionaire.

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Dustin Moskovitz, cofounder of Facebook and CEO of Asana

Getty/Araya Diaz

Age: 30

What he's done: Moskovitz co-founded Facebook with Mark Zuckerberg at Harvard, which turned him into a billionaire. After Facebook, Moskovitz went on to found a corporate communication platform, Asana. He's an angel investor in startups such as Path, Flipboard and Venmo.

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Patrick Collison and John Collison, cofounders of Stripe

Twitter/Screenshot

Age: 25 and 23

What they've done: Brothers Patrick and John Collison co-founded Stripe, a payment platform that's being used to power Apple Pay instead of PayPal. Stripe was most recently valued by investors at almost $2 billion.

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Michelle Phan, cofounder of Ipsy and YouTube personality

YouTube

Age: 27

What she's done: Michelle Phan, 26, is one of the most recognizable YouTube stars. Her videos, which focus on beauty and make up tutorials, have gained over 1 billion views. She just came out with a new book called "Make Up" and her startup, Ipsy, brings in $84 million a year.

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Greg Duffy, cofounder and CEO of Dropcam

Dropcam

Age: 27

What he's done: Duffy was the CEO and founder of Dropcam, a smart surveillance company that was acquired by Google for $555million in 2014. Dropcam allows anyone to access video footage remotely from a smart phone.

What he's done: Kushner co-founded Vostu, a gaming startup that soared to a high valuation before cratering when he was in college. He attended Harvard Business School then raised a seed fund to invest in early-stage startups. His first fund got money into hit startups such as Facebook-acquired Hot Potato and Skype-acquired GroupMe. He has gone on to raise a few more $100 million+ funds and invested in startups such as Instagram and Whisper. Kushner is still an entrepreneur; he co-founded insurance company Oscar last year and its valuation now exceeds $800 million.

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Jessica Alba, actress turned entrepeneur

Reuters/Stephen Lam

Age: 33

What she's done: Actress-turned-entrepreneur Jessica Alba is cofounder and CEO of Honest, a billion-dollar ecommerce company that's already plotting to go public. Unlike other celebrity CEOs, Alba is extremely active within the company and has scaled back her role as an actress to make running a successful business a top priority. She runs the company with Brian Lee, an entrepreneur behind ShoeDazzle and LegalZoom.

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John Zimmer, cofounder and President of Lyft

Lyft

Age: 30

What he's done: Zimmer is the founder and President of ride-sharing startup, Lyft. Lyft is rivaling Uber to be an on-demand service that could eventually eliminate the need to buy a car. Lyft has raised more than $330 million and it was last valued at more than $700 million. It's in dozens of cities throughout the US and may be expanding globally later this year.

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Palmer Luckey, founder and CEO of Oculus RV

What he's done: Luckey is the founder of Oculus VR, a company that was acquired by Facebook for $2 billion in 2014. Mark Zuckerberg believes Luckey may have created the next major computing platform and building out Oculus is a major part of his 10-year plan for Facebook's success.

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Alexia Tsotsis, Editor-in-Chief of TechCrunch

What she's done: Tsotsis is the editor-in-chief of Silicon Valley's most read and respected publication, TechCrunch. She was part of the team under founder Michael Arrington when it was acquired by AOL for nearly $30 million and she's risen through the ranks there to be a lead scoopster and influencer in media.

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Sean Rad, CEO and cofounder of Tinder

What he's done: Rad is the co-founder and CEO of the hottest dating app around, Tinder. Tinder has exploded to an estimated 50 million monthly active users with billions of profile swipes being generated each day. It is worth an estimated $750 million, although it's largely owned and controlled by Barry Diller's IAC, which also owns OKCupid and Match.

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Sam Altman, president of Y Combinator

Brian Ach / Getty Images

Age: 29

What he's done: Altman is the head of the world's most prestigious startup accelerator program, Y Combinator. He took over for its co-founder Paul Graham in 2014. The Y Combinator program has produced billion-dollar companies such as Dropbox and Airbnb. Altman also leads lectures at Stanford, where he has notable CEOs such as Dustin Moskovitz teach startup lessons to students.

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Divya Nag, Special Projects at Apple

Divya Nag

Age: 22

What she's done: Nag joined Apple in 2014 in its special projects division, where she's leading R&D on medical and healthcare technologies. Prior to joining Apple, Nag was cofounded StartX Med at Stanford, a startup accelerator program affiliated with the school.

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Meredith Perry of uBeam

Courtesy of Meredith Perry

Age: 25

What she's done: Perry just raised $10 million for her company called uBeam. Perry believes she will be able to deliver energy wirelessly through the air using ultrasonic sound waves. Sound impossible? Well, some people think it is! But Perry, and her very impressive investors, think it's for real.

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Julia Hartz, cofounder and president of Eventbrite

Age: 34

What she's done: Hartz is the co-founder and president of online ticketing company Eventbrite, which she created with her husband, Kevin. Eventbrite was recently valued at more than $1 billion. The Hartz's are also smart angel investors who have put money into companies like Pinterest.

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Rachel Haot, Chief Digital Officer of New York

NEW YORK, NY - APRIL 03: Chief Digital Officer for the City of New York, Rachel Sterne Haot attends the Glamour And L'Oreal Paris Celebration for the Top Ten College Women at The Diana Center At Barnard College on April 3, 2013 in New York City. (Photo by Astrid Stawiarz/Getty Images for GLAMOUR)
Astrid Stawiarz/Getty

Age: 31

What she's done: Rachael Haot is Chief Digital Officer and Deputy Secretary of Technology for New York State, under Governor Cuomo's administration. She previously served as NYC's Chief Digital Officer under former mayor Michael Bloomberg.

What he's done: Lonsdale was one of the youngest PayPal mafia members alongside Max Levchin and Peter Thiel, having joined the payment company when he was a student at Stanford. Lonsdale went on to cofound one of Silicon Valley's most important and valuable companies, Palantir. Then he cofounded another startup, Addepar. Lonsdale is also a founding partner at Formation8, an investment firm that's backed startups such as Wish and OpenGov.

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Ryan Graves and Austin Geidt, head of global operations and head of global expansion at Uber

Uber

Age: 30 and 28 (estimate)

What he's done: Graves grew Uber from a one person company to a $17 billion company with the aid of cofounders Travis Kalanick, Oscar Salazar and Garrett Camp. Graves was the company's first CEO. Now he's the company's board director and head of global operations.

Geidt was Uber employee #4. She now heads up global expansion for the company, which operates in 45 countries.

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Sophia Amoruso, founder and CEO of NastyGal

Reuters/Mario Anzuoni

Age: 30

What she's done: Amoruso founded trendy ecommerce shop Nasty Gal and recently wrote a memoir, Girl Boss. Her company is doing more than $100 million in sales and it's raised nearly $50 million from top venture capitalists.

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Matt Salzberg, CEO and cofounder of Blue Apron

LinkedIn / Blue Apron / LinkedIn

Age: 30

What he's done: Salzberg's startup, Blue Apron, is one of NYC's most valuable startups. It was recently given a $500 million valuation by investors, and it was generating $3 million per month at the end of 2013. Blue Apron delivers perfectly portioned ingredients and recipes so people can cook new meals easily without running to the grocery store or wasting food.